Study on Anti-Interference Code Timing Estimate Algorithms of CDMA Based on Differential Correlation Technology

In this paper, we propose aimple and efficient algorithm for code timing acquisition in direct-sequence code-division multiple-access communication system. The essential assumption is that an unmodulated pilot channel is available for the desired user. Then the correlation matrix of sampled data, where the suitable time lag is selected, contains the timing information only of desired user, while the contributions of uncorrelated interferences and noise are suppressed out. The experiment results show that more interference suppression and correct synchronization probability are achieved comparing to the conventional approach.